问题
So this is for a SSRS report so I'm using temp tables. I have two tables, one for transactions that I'm just using it to pull the account and the amounts. The second is amortized delinquency information I'm trying to adjust based on the transaction but I'm running into syntax issues. Are case statements not allowed to be used with cursors or updates?
--Example Transaction:Account 123456 Principal 500.00 Interest 250.00
delinquent 5 months of 200 principal each month, the transaction had principal amount of 500, the first two are left alone, the third is reduced to 100 to match the total to the transaction amount, leaving a remaining amount of 0
--Delinquent data
-- 11/2015 Prin 200 Int 80 -> Prin 0 Int 0 (running total Prin 500 Int 250)
-- 10/2015 Prin 200 Int 80 -> Prin 0 Int 10 (running total Prin 500 Int 250)
-- 9/2015 Prin 200 Int 80 -> Prin 100 Int 80 (running total Prin 500 Int 240)
-- 8/2015 Prin 200 Int 80 -> Prin 200 Int 80 (running total Prin 400 Int 160)
-- 7/2015 Prin 200 Int 80 -> Prin 200 Int 80 (running total Prin 200 Int 80) <- process starts from the oldest and goes up.
This requires the use of a cursor because I cannot process in a set as it has to start with the oldest row, adjust, find the remaining total, then carry on adjusting the next row. If the transaction amount is reached, the remaining rows are zeroed out. I'm then returning the remaining amounts to the transaction table.
Declare TranCursor Cursor FORWARD_ONLY
For Select LoanNumber, PrincipalCollected, InterestCollected, ServiceFee, PayoffPrincipal,PayoffInterest,PayoffServiceFee
From #transFinal
FOR UPDATE OF PayoffPrincipal,PayoffInterest,PayoffServiceFee
Open TranCursor;
Fetch next from TranCursor into @TranLoan, @TranPrin, @TranInt, @TranServ, @POPrin,@POInt,@POServ
while (@@Fetch_status = 0)
Begin
--Process this individual loan's transaction by going through each set of amortized amounts starting with the oldest and reducing excess of transaction amounts to zero.
--eg. delinquent 3 months of 200 principal each month, the transaction had principal amount of 500, the first two are left alone, the third is reduced to 100 to match the total to the transaction amount
--Transaction Principal 500 Interest 250
--Delinquent data
-- 11/2015 Prin 200 Int 80 -> Prin 0 Int 0 (running total Prin 500 Int 250)
-- 10/2015 Prin 200 Int 80 -> Prin 0 Int 10 (running total Prin 500 Int 250)
-- 9/2015 Prin 200 Int 80 -> Prin 100 Int 80 (running total Prin 500 Int 240)
-- 8/2015 Prin 200 Int 80 -> Prin 200 Int 80 (running total Prin 400 Int 160)
-- 7/2015 Prin 200 Int 80 -> Prin 200 Int 80 (running total Prin 200 Int 80) <- process starts from the oldest and goes up.
Declare DelqCursor CURSOR FORWARD_ONLY
FOR select LoanNumber,DelqPrin ,DelqInt ,DelqServFee from #dq
where LoanNumber = @TranLoan
Order by PaidToDate Asc
For update OF DelqPrin, DelqInt, DelqServFee;
Open DelqCursor;
-----------------------------------------------------------------------------------------------------------
-- Processing individual row of delinquent data
-----------------------------------------------------------------------------------------------------------
Fetch next from DelqCursor into @DelqPrin, @DelqInt, @DelqServ, @DelqPTD --, @POPrin,@POInt,@POServ
while (@@Fetch_status = 0)
BEGIN
CASE when @TranPrin = 0 then set @DelqPrin = 0 -- Syntax error on case
WHEN @TranPrin >0 and @TranPrin > @DelqPrin then -- Syntax error on when
set @TranPrin = @TranPrin - @DelqPrin
set @ColPrin = @ColPrin + @DelqPrin
WHEN @TranPrin >0 and @TranPrin < @DelqPrin then
set @ColPrin = @ColPrin + @TranPrin
set @TranPrin = 0
set @DelqPrin = @DelqPrin -@TranPrin
end
CASE when @TranInt = 0 then set @DelqInt = 0
WHEN @TranInt >0 and @TranInt > @DelqInt then
set @TranInt = @TranInt - @DelqInt
set @ColInt = ColInt + @DelqInt
WHEN @TranInt >0 and @TranInt < @DelqInt then
set @ColInt = @ColInt + @TranInt
set @TranInt = 0
set @DelqInt = @DelqInt -@TranInt
end
CASE when @TranServ = 0 then set @DelqServFee = 0
WHEN @TranServ >0 and @TranServ> @DelqServ then
set @TranServ = @TranServ - @DelqServ
set @ColServ = ColServ + @DelqServ
WHEN @TranServ >0 and @TranServ < @DelqServ then
set @ColServ = @ColServ + @TranServ
set @TranServ = 0
set @DelqServ = @DelqServ -@TranServ
end
Fetch next from DelqCursor into @DelqPrin, @DelqInt, @DelqServ, @DelqPTD
End
-----------------------------------------------------------------------------------
--All rows of delinquent data for a single loan have been processed. Now we update the Payoff columns
----------------------------------------------------------------------------------
Set @PoPrin = @ColPrin
Set @PoInt = @ColInt
Set @PoServ = @ColServ
--Todo Finish update statement for outside loop to update transaction table
Close DelqCursor-- Finished with delinquent data for this loan. We close the cursor
Fetch next from TranCursor into @TranLoan, @TranPrin, @TranInt, @TranServ, @POPrin,@POInt,@POServ --Start Processing next loan
End
Close TranCursor
deallocate DelqCursor
deallocate TranCursor
I'd appreciate any insight I can get to figure out why my case when statements are giving me errors. I see nothing in the msdn syntax that would prevent case logic from working.
回答1:
The way you have coded your CASE statements will not work. Case logic needs to happen within a SELECT, or SET. Yours are just out there, and the SET is in the middle, after the THEN.
You will need to change your logic to something like this for each CASE you have in your code.
IF @TranPrin = 0
SET @DelqPrin = 0
IF @TranPrin >0 AND @TranPrin > @DelqPrin
BEGIN
SET @TranPrin = @TranPrin - @DelqPrin
SET @ColPrin = @ColPrin + @DelqPrin
END
IF @TranPrin > 0 AND @TranPrin < @DelqPrin
BEGIN
SET @ColPrin = @ColPrin + @TranPrin
SET @TranPrin = 0
SET @DelqPrin = @DelqPrin -@TranPrin
END
CASE (Transact SQL) Reference
来源：https://stackoverflow.com/questions/38404242/nested-cursor-based-update